Refrigerating system



May 30, 1933. s. A. PEARSON REFRIGERATING SYSTEM Filed April 12. 1929 2Sheets-Sheet l Exmwszuu Maw/c HEFHIGERATING SYSTEM Filed April 12. 19292 Sheets-Sheet IIIIIIIIAWII'IIIIIIIJ v 92 6 J2 96 3 a? 64 Patented May30, 1933 PATENT OFFICE SWAN A. PEARSON, OF CHICAGO, ILLINOISREFBIGEBATING SYSTEM Application filed April 12, 1929. Serial No.354,479.

This invention relates to refrigerating systems and more particularly toa generally improved apparatus for removing foul or other forei n gasesfrom the system.

5 I shall (ascribe the invention in connection with the removal ofdeleterious gases and shall refer to certain illustrative examples; butit is to be understood that the invention is not limited to the removalof any particular gases but may be employed for removing anyobjectionable fluids whether in vapor or gaseous sta It 15 wellunderstood in the art that in a refrigerating system the higher thepressure the greater the refrigerating action in the system. Thepresence of noncondenisible or relatively fixed gases in the system tendto reduce the capacity and efliciency of the system and are frequentlydangerous; and 3 it is the object of the present invention to provide agenerally improved, simplified, efficient and inexpensive method forremoving the foul gases or other objectionable fluids without throttlingor reducing the desired high pressure in the system.

Another object is to return the liquid from the purging chamber througha path other than the path of gas entry into the chamber. Another objectis the provision of an apparatus for removing foul or otherobjectionable fluids with a minimum of refrigerant loss. Another objectis the provision of an improved counter-current cooling eflect withinthe purging apparatus, and a more uniform distribution of the foul orobjectionable ases about the cooling coils within the purging chamber.Another object is the provision of a trapping effect upon the foul gaseswithin the purging chamber and a further object is the provision of animproved foul gas discharge regulator for removing the foul or otherobjectionable fluids automatically and without manual attention as wellas without loss of an appreciable amount of the refrigerant.

Other objects and advantages of the present invention will more fullyappear from the following detailed description taken in connection withthe accompanying drawings which illustrate one embodiment of theinvention and in which;

Fig. 1 is a view illustratin a more or less diagrammatic embodiment othe present invention with the purging chamber and cooling coil thereforin section;

Fig. 2 is a vertical sectional view through the automatic foul gasdischarge regulator taken on the line 2-2 of Fig. 1; and

Fig. 3 is a fragmentary detail section taken on the line 3-3 of Fig. 2.

Referring to the drawings, the particular apparatus selected forillustration comprises a chamber 10. A pipe 11 leading from the receiverof the refrigerating system or from any other source which might havefoul or other objectionable gases or fluids which it is desired toremove enters the chamber 10 preferably at the top thereof as shown.Foul gases are commonly trapped or collected in the top of the receiverand in that case the pipe 11 will preferably be connected with and leadfrom the to ofthe receiver. It is to be understood, however, that thisis merely illustrative. Sometimes these ases are trapped in thecondenser and in $110 case the pipe 11 will have connection with theparticular part of the system from which it is desired to remove thefoul gases or fluids. Ordinarily the liquid in pipe 11 will be underfull condenser or receiver ressure.

The details of the re rigerating system per se form no part of theresent invention and may vary widely. The apparatus of the presentinvention may be quickly and easily installed with any existing orsuitable refrigerating system, and where necessary the details of theapparatus of the present invention may be varied to accommodate it todifferent systems as desired.

So far as the details of the refrigerating s 'stem per se are concerned,suflice it to say t at the liquid ammonia or other desired refrigerant,which may vary, is usually suplied under pressure to a suitable receiverrom the condenser (not shown) to which the ammonia or other refrigerantis usually supplied in vapor form from the usual com- 11 would lead fromthe condenser, it being understood that the pipe VII pressor (notshown). The liquid refrigerant is supplied from the receiver to theusual refrigerating room or ice making tanks or coils (not shown) and inoperation the ammonia, gas or other refrigerant is usually supplied fromthe compressor to the condenser where it is reduced in temperaturesufliciently to render it liquid, after which it is usually conductedinto the receiver usually with the pressure maintained. From thereceiver the refrigerant is usually led to the refrigerating room or icemaking tank or coils where it is allowed to expand and thereby cools theroom or coils, and from the refrigerating room the refrigerant is drawninto the inlet side of the compressor and the cycle is repeated.

The foregoing is merely illustrative of refrigerating systems now in useand being a matter of common knowledge, that knowledge is incorporatedherein by reference and disclosure in the drawings is believedunnecessary.

In a refrigerating system there are numerous sources of 'non-condensiblegas accumulations. So far as a refrigerating system is concerned,atmospheric air is considered as a non-condensible gas and it, and theother gases which will be referred to, are intended to come within thegeneral term foul gas or foul fluid as used herein. It is practicallyimpossible to expel all of the air from the entire system even instarting up a new system, and after operation the air enters throughleaky connections and the like. Decomposition of ammonia is anothersource of non-condensible gas. There are others but these areillustrative and will suflice. The line 11 is preferably provided with aglobe, angle or other control valve 13 and also preferably with arelease valve 14 for automatically relieving or venting excessivepressures in this line as is well understood in the art.

The top of the chamber 10 is closed by a top member 15 and the bottom isclosed by a bottom member 16. The top and bottom members 15 and 16 maybe spot welded in place as shown at 17 in Fig. 1, or otherwise securedsuitably in place. The outlet or liquid spill pipe 18 leads from thebottom of the chamber 10 and is connected, for example, to the suctionline of the compressor, or with any other part of the system to which itis desired to spill or return the liquid. The pipe line 18 is preferablyprovided with a globe, angle or other suitable control valve 19.

The pipe 18 is preferably provided within the chamber 10 with anupstanding end terminating at a suitable height above the bottom of thechamber in an open end 20 through which liquid in the chamber 10 abovesaid open end 20 may enter the pipe 18.

To prevent access of the gases within the chamber 10 to the top of thepipe 18 when the liquid level within the chamber 10 is relatively low,the upper end of the pipe 18 is preferably surrounded by a cup-likemember 22, preferably of circular section as is the chamber 10, althoughthis may vary. The top of this cup-like member is closed at 23 and thelower end of the surrounding side wall is Welded or otherwise suitablysecured at 24 to the bottom member 16. Ports 25 through the side wallsof the cup-like member 22 permit entry of the liquid from the bottom ofthe chamber 10 into the cuplike member 22 and to the upper end of thepipe 18. These ports 25 are preferably disposed down adjacent the bottommember 16 to be liquid sealed, even with only a relatively slight liquidlevel within the chamber 10.

A baiile 28, which may also be of circular section, although this mayvary, is disposed preferably concentrically within the chamber 10 withits lower end open and concentrically surrounding the cup-like member 22and terminating short of and preferably spaced above the bottom member16 of the chamber 10.

The upper end of the baflie sleeve 28 preferably extends to the topmember 15 and is welded or otherwise suitably secured thereto at 29. Thebaflle 28 is provided with a plurality of ports 30 arranged circularlyaround the baffle and preferably disposed at a level slightly above theupper open end 20 of the pipe 18 to be constantly uncovered due to thelower level liquid outlet. These ports 30 are for the entry of thenon-condensible gases or at least the gases not condensed within theannular condensing space 32 between the baflle 28 and the wall of thechamber 10 through the ports 30 into the interior space 34 enclosed bythe baflle 28. The non-condensed gases thus delivered to the space 34are discharged into a foul gas outlet 36 leading from the top of thespace 34 through the top member 15.

It will be apparent that flow of gases from the condenser or receiverthrough pipe 11 and valve 13 provides for a slight expansion of thesegases and consequent cooling, since the gases, which are under condenserpressure, are discharged into the chamber 32, which chamber is providedwith cooling coils which condense a portion of these gases and cool theremainder. This condensing and cooling action will necessarily result ina reduction of pressure of the gas, in accordance with established lawsof thermodynamics. Consequently there will be a small drop in pressurefrom the pipe 11 to the chamber 32, which will result in a coolingefl'ect, due to the expansion of the gases entering the chamber 32.However, the pressure in chambers 32 and the complementary 34, becauseof the restricted valved outlet, will still be considerably above atmosheric pressure, and the foul gases will be orced out through outlet 36to the discharge valve. The pressure within the chambers 32 and 34remains substantially constant, since any loss of pressure throughtheoutlet 36 is compensated for by the fluid entering through pipe 11, anda substantially balanced pressure will be maintained during normaloperation of the system.

Within the annular space 32 and the space 34 is preferably arranged anexpansion or cooling coil 40, one end of which may be connected througha pipe 41 and valve 42 with the suction side of the compressor and theother end of which may be connected through an expansion valve 43 andpipe 44 with any suitable source of ammonia liquid or other refrigerant.The pipe 44 rovides the inlet to the coil 40 from the bottom of thereceiver or other refrigerant source and the pipe 41 provides the outletfrom the coil 40 to the inlet side of the compressor.

The foul gas outlet 36 leads through a globe, angle or other valve 48and pipe 49 to an automatic foul gas discharge re ulator designated inits entirety at 50. T is discharge regulator 50 comprises a body part 52having a reduced threaded stem 53 extending upwardly therefrom forreceiving a head member 54 which may be screwed thereon as shown. Thehead member 54 is enlarged at 55 and is clamped as by means of screws 56to the lower similarly enlarged end 57 of a complementary head part 58.The head part 58 has an upwardly domed portion 59 and disposedsubstantially concentrically within this upwardly domed ortion 59 is asimilarly domed metallic shell 60, flanged at 61 and secured at 62 tothe inner edge of an annular diaphragm member 63, the outer edge ofwhich diaphragm member 63 is tightly clam ed at 64 between the enlargedparts 55 an 5 of head members. he head member 58 with the diaphragm 63and the domed shell which is pre erably relatively thin and of goodconducting metal completely enclose a space 64' which is filled orsubstantially filled with an exansible fluid such as ammonia or ammoniaIn combination with some other fluid, altihough other fluids may beemployed. The

1a leat er which is not subject to corrosion and at the same timeprov1des a sensitive and readily yieldable connection between theslahell 60 and the head of the discharge reguator.

The upper enlarged part 55 of the head member 54 defines a space 68which is in communication at 69 with interior 70 of the shell 60. A ventport 72 opens from the the valve stem is ragm 63 is preferably of rubberor space 68 out at 73 from the head member 54 for discharging thenon-condensible or other foul or undesirable gases. Internally the bodypart 52 has a passage 75 which is adapted to communicate through areduced co-axial passage 76 with the interior 70 of the shell 60.Internally the body part is tapered at the entry of the passage 75 tothe reduced passage 76 providing a tapered seat 78 against which atapered shoulder 79 on adapted to seat and to close ofl communicationfrom the passage 7 5 to the space 70. Beneath the tapered seatingshoulder 79 the stem 80 is flanged at 81, this flan e 81 fittingrelatively snugly but having ree sliding fit in the passage 75. Thelower end of the passage 7 5 is internally threaded at 82 to receive thereduced threaded stem 83 of a cap member 84 which is threaded into andcloses oil the lower end of the passage 75. The body part 52 and the cap84 may have external polygonal surfaces 85 and 86 respectively forengagement by a wrench or other suitable tool. A coiled spring 88surrounds the stem 80 and is confined between the cap 86 and the flange81 and normally urges the valve shoulder seat zipward toward thecooperating valve seat The pipe 49 may be threaded into the body part 52and the gases or other fluids discharged through the pipe 49 enter thepassage wa 75 through the passage way 90 shown disposed substantiallynormal thereto and constituting the inlet into the automatic foul gasdischarge regulator.

The upper end of the valve stem 80 is re duced at 92 and this reducedupper end 92 preferably has a relatively close sliding fit in thepassage 76. The periphery of that portion of the stem part 92 whichoperates in the passage 76 is provided with a plurality of longitudinalgrooves 93 which are proportioned to provide communication between theenlarged passage 75 and the space 70 when the tapered valve shoulder 79is unseated from the cooperating tapered seat 78 and the upper end ofthe stem 92 is preferably rounded at 94 and is held in contact with theupper rounded end of the shell 60 by the spring 88. The lower end of thestem 80 is reduced at 95 and is movable in an axial recess 96 in the capmember 86. The slotting of the valve stem part 92 at 93 provides thedesired communication between the passage 75 and the space 70 forventing the foul gases from the space 70 through the space 69 and intothe space 68 from whence said gases are discharged, for example, to theatmosphere through the ports 72.

In starting the system the foul gas discharge valve 79 is closed bybacking off the hood 58 sufliciently to allow the spring 88 to seat thevalve shoulder 79 upon the seat 78.

The valves 13 and 19 are nod and the expansion valve 43 is opene topermit a flow of refri ran? from. the receiver or other source t roughthe coil 40 and back to the suction side of the compressor. The

expansion of the ammonia or other refrigerant in the coil 40 reduces thetemperature in the chamber sufliciently that an ammonia or refrigerantvapor carried 0 with the foul or contaminating gases throu h the pipe 11and into the top of the cham or 10 as indicated by the arrow 98 in Fi 1is condensed. The refrigerating or cooling action in the coil 40 isreferably such as to cool the liquid or fluig down to the lowestpossible temperature depending u on the suction pressure of the system.is condensation of a portion of the gases and cooling of the remainderwill result in a consequent lowering of the pressure, the reduction inpressure of a gas being directly proportional to a reduction intemperature. To permit backing oil the hood 58 without releasing theliquid seal between this hood and the diaphragm 63 the diaphragm may besecured marginally to the hood 58, if desired.

The opening of the valve 13 permits any foul, contaminating or othergases and any vaporized ammonia or vaporized refrigerant containedwithin the top of the receivor where the pipe 11 leads from the top ofthe receiver or contained within any other part with which the pipe 11has communication to rise into the top of the chamber 10.

Any ammonia or refrigerant vapor is condensed and drops to the bottom ofthe chamber 10 as indicated at 99 in Fig. 1 and when the level of theliquid condensate rises sufficiently to enter the top of the stand pipe20, it is returned or spilled throu h the )ipe 18 from the bottom of thechain MW 10 ack to the receiver or to any other desired or suitable partof the system.

Any gases not condensed within the annular space 32 pass around thelower end of the annular baflle 28 or where the liquid has risen abovethe lower end of this bafllc, as shown, pass through the ports 30 andinto the space 34. It should be noted that the How of refrigerantthrough the coil is counter to the passage of gases or other fluidsthrough the baflled chamber 10. The lesser cooling action provided atthe top of the space 32 by the coil 40 condenses out the more readilycondensible vapors or gases and the increased cooling action provided bythe coil 40 downwardly through the space 32 and upwardly through theinner space 34 provides an increasing cooling action, serving to providea more complete condensing out of the condensible vapors or gases intheir passage through the chamber 10 and This counter-current effect isan space 34.

important aspect of the invention.

should also be noted that the liquid is returned or spilled back throughthe ipe 18 and not through the same assa e through which the gases areadmitte to t e chamber l0. This is another important aspect of theinvention.

The non-condensible gases or at least the gases not condensed out by thetime the reach the top of the space 34 and which refer to herein as thefoul gases, are discharged through the pipe 36 valve 48 and pipe 49 intothe passage of the discharge regulator through the passage 90. Afterstarting, the hood 58 of the dlschar e regulator is screwed down enoughto bac ofi the valve shoulder 79 from the seat 78 just sufliciently totake 011' the foul gases, say, as formed, and without appreciable lossof ammonia gas. The foul gases entering the space 75 pass along theupper reduced end of the valve 92 through the grooves 93 and into thespace 70 from where they are permitted to escape through the annularspace 69, space 68, and through the ports 72 to atmosphere. Ifappreciable ammonia or other refrigerant enters the discharge regulatorit will pass with the foul gases up into the space 70 and by anexpansion effect or otherwise will reduce the temperature within thespace 70. It is to be understood that the foul gases entering thechamber 32 and passing up through the chamber 34 will increase intemperature after leaving the chamber 34 and will not materially affectthe temperature of the liquid 64 in the expandible chamber. However, ifa large percentage of vaporized liquid ammonia enters the chamber 32from the pipe 11, its expansion upon entering the chamber after beingreleased from the pressure that it has been subjected to in the pipe 11Will produce a marked cooling effect. The pressure existing in thechambers 32 and 34 is above .at-

mospheric pressure, and this cooled gas,

passing through valve 79 into chamber 70, which is at atmosphericpressure, due to the outlet 72 to atmosphere, will expand further,producing a still further decrease in temperature. As is apparent, adouble expansion of the refrigerant gas takes place, with a resultingcooling effect, whereas with no refrigerant gas present, the tendency isfor the temperature of the foul gases to increase after leaving chamber34. This reduction in temperature, when refrigerant gases are present,will contract the liquid within the space 64' and this contraction ofthis liquid will permit the valve 79 to rise under the action of thespring 88 and to seat upon the valve seat 78 and thereby automaticallyclose the foul gas discharge regulator. For example, should the receiverfill with liquid and the condenser or drum fill with liquid ammonia orother refrigerant escaping through the automatic valve this redensateoutlet leading from the bottom of ingerant will contract the expansi leliquid the receptacle.

64 and close the valve automatically against 2. The combination with arefrigerating loss of the refrigerant. system of a receptacle, a as lineconnecte 5 The apparatus may therefore be made to said receptacle foradmitting condensable wholl automatic for automaticall opening andnon-condensable gases into the interior the dlscharge re ulator and forc osing the of the receptacle, an outlet for the dischar e sameautomatica 1y depending upon the perof non-condensable gas from saidreceptac e, centage of refrigerant discharge with the means within thereceptacle for cooling the foul or objectionable gases. This is-animgases admitted therein so as to condense the 7 portant aspect of theinvention. As the percondensable gas, baflie means disposed withcentagef 1 or d ib1 gases 1n the receptacle'between said gas inlet and againincreases the rise in the temperature said non-condensable gas outlet, acondenwithin the space will expand the expansate outlet leading from thebottom of the 15 dible liquid in the space 64' unseating th rece tacle,means for trapping some of the valve 79 for the automatic discharge ofthese con ensate within the rece tacle and means foul gases toatmosphere through the ports wl hm the receptacle an adated to be sealedby the condensate trapp in the re A steady and continuous discharge ofceptacle for preventing entry into said con- 5 foul gases will takeplace in accordance with densate outlet of non-condensable gas ad- 35the percenta e of non-condensible gases admitted into the receptacle. 7mitted into ambers 32 and 34 by pipe 1 1. 3. The combination with arefrigerating If, due to lack of sufiicient cooling within system, of apurging receptacle, a generally the chamber, uncondensed refrigerantgases annular bafile forming a nerally annular "pass throu 'h the outlet36, the discharge space within said rccptac e, said baflie'bevalve willautomatically closed to premg closed at the top and open at the bottomvent loss of refri erant, this closing being to said generally annularspace, a gas inlet efiected by the coo ing occasioned by the seclineconnected with the top of said generally 0nd expansion of therefrigerant gases as annular s ace, a foul fluld outlet adjacent theypass from chamber 34 into the chamber the top 0 the space within saidenerally 68, the valve 79 seating upon the valve seat annular baflle anda liqluid outlet rom the 78, due to the contraction of liquid in thebottom of said receptac e. dome 59 of the valve. 4. The combination witha refrigerating Ordinarily, however, the reduction 1 n s stem, of apurging receptacle, a generpressure between pipe 11 and chamber 32 1s ay annular bafile forming a generally small and the cooling coils 40 willsuilice, annular space within said receptacle, said together with thecooling efiected by the bailie being closed at the top and open atexpansion of the gases upon the reduction the bottom to said generallyannular space, in ressllre occasioned by condensation and a gas inletline connected with the top of coo ing, to condense all the refrigerantsaid generally annular s ace, a foul fluid see, and only a restricteddischarge of the outlet adjacent the top 0? the space within oul gaseswill continue to talze place said generally annular baflle, a liquidoutlet The reduced stem part 92 is reduced befrom the bottom of saidreceptacle, said a low the grooves 93 as by means of an anliquid outletextending up into the bottom nular slot 100 (Fig. 2) whlch rovldes forof the rece tacle and forming a liquid trap obtaining closer regulation.e foul g and a hoe surrounding said u wardl exopenings 30 throug thelower ends f th tending liquid outlet, said hood ing osed annularbafiie'28 providerestrictwn wh at the top and havingport means openingproduce a more even distr butlon of h at the bottom fromsaid generallyannular 5 gases about the c011 40, particularly within space i t id h lthe annular space 2- 5. The combination 'th 0. refrigerating I do notintend to be limited to the plflsystem, of a purging receptacle, agenerally cise details shown or des rl annular bafile forming agenerally annular I claim: space within said receptacle, said bafliebeing 65 1. The combination with a refrigerating c osed at the top andopen at th b tt t system of a receptacle, a gas line connecte f saidgenerally annular space, a s inlet line -to said receptacle foradmitting condensable o ne ted wlth the to of ud ene lly andnon-condensable gases into the interior annular s ace, a foul fluidoutlet adjacent of the recegtacle, an outlet for the dischar e the top 0the space within said generally of non-con ensable gas from saidreceptac e, annular baflie, a liquid outlet from the botmeans within thereceptable for cooling'the tom of said receptacle, said liquid outletexs admitted therein so as to condense the tending up into the bottom'ofthe recggtacle condensable gas, baflle means disposed withand forming aliquid trap and a ho sur- -in the receptaclebetween said gas inlet androunding said u wardly extending liquid "said noncondensable gas outletand a eonoutlet, said hoo being closed at the top 131 and port meansopening through said baflie above the top of said upwardly extendingliquid outlet.

6. The combination with a refrigerating system, of a purging receptacle,a generally annular bafile forming a generally annular space within saidreceptacle, said baflle being closed at the top and open at the bottomto said generally annular space, a gas inlet line connected with the topof said generally annular space, a foul fluid outlet adjacent the too ofthe space within said generally annular baflle and a cooling coilconvoluted throuv'h said generally annular space and through the spacewithin said baflie, said coil having an inlet at the top of the spacewithin the baflie and an outlet at the top of the generally annularspace.

7. The combination with a refrigerating system, of a purging receptacle,a generally annular baflle forming a generally annular space within saidreceptacle, said bailie being closed at the top and open at the bottomto said generally annular space, a gas inlet line connected with the topof said generally annular space, a foul fluid outlet adjacent the top ofthe snace within said generally annular baflie, a liquid outletextending up into the bottom of the chamber and forming a liquid trapand a hood surrounds ing said upwardly extending liquid outlet, saidhood being closed at the top and a cooling coil convoluted through saidgenerally annular s ace and throu 'h the space within said baths, saidcoil having an inlet at the topof the space within the baflie and anoutlet at the top of the generally annular space.

8. The combination with a refrigerating system of a receptacle, bafilemeans extending downwardly from the top of the interior of thereceptacle and dividing the interior of the receptacle vertically intoan inlet chamber and an outlet chamber, said bafile means separating theinlet chamber from the outlet chamber at the top and being open forcommunication between the inlet and outlet chambers adjacent the bottom,a gas line connected with the top of the inlet chamber for admittingcondensable and noncondensable gases into said chamber, an outlet forthe non-condensable gas at the top of the outlet chamber, means withinthe receptacle for cooling the gases admitted therein so as to condensethe condensable gas and a condensate outlet leading from the bottom ofthe receptacle.

9. A foul fluid discharge regulator for refri crating systems having aninlet and an out et, said regulator comprising a body part having apassage therethrough, a valve coutroll said passe and slidable therein,a hood ormmg wi said body part an enclosed chamber, a, flexiblediaphragm clamped between said hood and said body partand dividing saidchamber, a shell secured to said diaphragm and disposed within said hoodto form an ex audible fluid chamber between the shell an the hood and incommunication with the chamber on one side of said diaphra the interiorof said shell bein adapted iii? communication with the valve passagethrou h the bod and having communication wit the cham er on the otherside of said diaphragm and a foul fluid outlet from said last side ofsaid diaphragm chamber. j

10. A foul fluid discharge regulator for refrigerating systems having aninlet and an outlet, said part having a passage therethrough a valvecontrollin said passage and slidab e therein, a hoe forming with saidbody part an enclosed chamber, a flexible diaphragm clamped between saidhood and sand body part and dividing said chamber, a shell secured tosaid diaphragm and disposed within said hood to form an e andible fluidchamber between the shell an the hood and in communication with the,chamber on one side of said diaphra the interior of said shell beinadapted fo communication with the valve passage throu h the bod andhaving communication with the cham r on the other side of said diaphr acap member closing the one end of e passage through the body part and aspring confined by sald cap member and urging said valve member towardits seat and into cooperation with said shell. 7

11. The combination with a refrigerating system of a gurging receptacletherefor, 12. line leading om the system to the interior of said urgingreceptacle for discharging foul flui s from said system to the interiorof said rece tacle, cooling means for the interior of the receptacle,and a liquid return line for spilling liquid from the purging receptacleinde ndently of the path of delive of the foul iiuids to said receptacleand in ependently of the cooling means for the receptacle and theconnections for said coo g means. a

12 A foul fluid discharge regulator for refrigeratmg systems having aninlet and an outlet, 11 valve for said regulator, means formlng achamber expandible and contractible with temperature variations forautomatically controlling said valve, the means forming said chamberinclu a. flexible leather diaphragm disposed in e path of flow of thefoul gases from the refrigerating system and through said regulator.

13. Thecombination with a refrigerating system of a receptacle 7 havingapurging chamber, a gas line connected to said chamber, means within saidchamber for the gases admitted therein so as to condense the entrainedcondensable gas, a condensate outlet at the bottom of the purgingregulator comprising a body chamber, means for tra'ping some of thecondensate within sai chamber, means adapted to be sealed by thecondensate trapped within the chamber for preventing entry into saidcondensate outlet of noncondensable gas admitted to the chamber and anoutlet for the noncondensable gas.

14. The combination with a refrigerating si lstem of a receptacle havinga urging c amber, means within said cham er for cooling the gasesadmitted therein so as to condense the entrained condensable gas, a.

condensate outlet at the bottom of the purging chamber, means fortrapping some of the condensate within said chamber, means adapted to besealed by the condensate trapped within the chamber for preventing entryinto said condensate outlet of noncondensable gas admitted to thechamber, a hood over the condensate outlet and having port means belowthe level of the liquid adapted to tra ped within said chamber and anoutlet rom the top of the chamher for non-condensable gas admitted tothe chamber. In witness whereof, I hereunto subscribe my name this 8thday of April 1929.

swan A. PEARSON.

CERTIFICATE OF CORRECTION.

Patent No. 1,911,464. May 30, 1933.

SWAN A. PEARSON.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 7,line 10, claim 14, before "means" insert the words "a gas line connectedto said chamber,"; and that the said Letters Patent should be read withthis correction therein that the same may conform to the record of thecase in the Patent Office.

Signed and sealed this 15th day o August, A. D. 1933.

M. J. Moore.

(Seal) Acting Commissioner of Patents.

chamber, means for tra'ping some of the condensate within sai chamber,means adapted to be sealed by the condensate trapped within the chamberfor preventing entry into said condensate outlet of noncondensable gasadmitted to the chamber and an outlet for the noncondensable gas.

14. The combination with a refrigerating si lstem of a receptacle havinga urging c amber, means within said cham er for cooling the gasesadmitted therein so as to condense the entrained condensable gas, a.

condensate outlet at the bottom of the purging chamber, means fortrapping some of the condensate within said chamber, means adapted to besealed by the condensate trapped within the chamber for preventing entryinto said condensate outlet of noncondensable gas admitted to thechamber, a hood over the condensate outlet and having port means belowthe level of the liquid adapted to tra ped within said chamber and anoutlet rom the top of the chamher for non-condensable gas admitted tothe chamber. In witness whereof, I hereunto subscribe my name this 8thday of April 1929.

swan A. PEARSON.

CERTIFICATE OF CORRECTION.

Patent No. 1,911,464. May 30, 1933.

SWAN A. PEARSON.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 7,line 10, claim 14, before "means" insert the words "a gas line connectedto said chamber,"; and that the said Letters Patent should be read withthis correction therein that the same may conform to the record of thecase in the Patent Office.

Signed and sealed this 15th day o August, A. D. 1933.

M. J. Moore.

(Seal) Acting Commissioner of Patents.

